The correct option is
A. sand.
Detailed Explanation:
Soil is classified based on the size of its particles, and these classifications are important for understanding soil properties and behavior. The particle size ranges are defined as follows:
- Clay: Particles smaller than 0.002 mm (2 micrometers).
- Silt: Particles ranging from 0.002 mm to 0.02 mm (20 micrometers).
- Sand: Particles ranging from 0.02 mm to 2.0 mm (2000 micrometers).
- Gravel: Particles larger than 2.0 mm.
Given these definitions, we can analyze the options:
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Option A: Sand - This is the correct answer because sand particles fall within the specified range of 0.02 mm to 2.0 mm. Sand is known for its gritty texture and is often used in construction and agriculture due to its drainage properties.
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Option B: Silt - This option is incorrect because silt particles are smaller than sand, specifically ranging from 0.002 mm to 0.02 mm. Silt has a smooth texture and retains moisture better than sand, but it does not meet the size criteria given in the question.
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Option C: Gravel - This option is also incorrect. Gravel consists of larger particles, specifically those greater than 2.0 mm. It is often used in construction and landscaping but does not fit the size range specified in the question.
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Option D: Clay - This option is incorrect as well. Clay particles are the smallest, measuring less than 0.002 mm. Clay has a sticky texture when wet and can hold a lot of water, but again, it does not meet the size criteria.
Summary of Key Points:
- Soil Particle Size Classifications:
- Clay: < 0.002 mm
- Silt: 0.002 mm - 0.02 mm
- Sand: 0.02 mm - 2.0 mm
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Gravel: > 2.0 mm
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Correct Answer: Sand (Option A) is the only type of soil that contains particles within the specified range of 0.02 mm to 2.0 mm.
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Incorrect Options:
- Silt is too small.
- Gravel is too large.
- Clay is also too small.
Revision Summary:
- Sand particles range from 0.02 mm to 2.0 mm.
- Silt particles are smaller than sand, while gravel particles are larger.
- Understanding soil particle sizes is crucial for agricultural practices and soil management.
- Always refer to the standard classifications when identifying soil types.